Apparatus for driving dynamic aperture and method of controlling the same

A driving device, dynamic technology, applied in projection devices, installations, instruments, etc., can solve the problems of high cost, reduced hole driving reliability, complex circuit structure, etc.

Inactive Publication Date: 2006-05-31
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0018] However, in the case where the position of the pivot 111 is detected using the Hall sensor 113 as described above, when the ambient temperature changes, the magnetization of the sensor magnet 112 corresponding to the rotation angle of the pivot 111 changes, so that even the pivot 111 is in the same position, the output of Hall sensor 113 will also change due to the ambient temperature
Therefore, the reliability of the hole drive decreases as the position feedback value changes depending on the ambient temperature
[0019] In addition, instead of Hall sensors, optical sensors or MR encoders that are not affected by ambient temperature can be used for position control, but it will result in high cost and complicated circuit structure

Method used

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  • Apparatus for driving dynamic aperture and method of controlling the same
  • Apparatus for driving dynamic aperture and method of controlling the same
  • Apparatus for driving dynamic aperture and method of controlling the same

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Embodiment Construction

[0034] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numbers refer to the same or similar parts throughout the different drawings.

[0035] The present invention provides a device for driving the position of a dynamic hole using the Hall effect, in which a characteristic change of a sensor magnet depending on a temperature change is detected, so that errors in position detection are compensated using the characteristic change, thereby precisely controlling the dynamic hole.

[0036] Figure 5a and Figure 5b An embodiment of an improved dynamic aperture drive according to the invention is shown.

[0037] see Figure 5a , the dynamic aperture driving device according to the present invention includes a pivot shaft 111, the upper end of which is integrally formed with the hole in the projection lens group 40 of the projection optical system 1c, so ...

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Abstract

The invention discloses a dynamic aperture driving device for adjusting the light quantity of a projection optical system and a control method thereof. The system includes a rotating device, a driving device, a first detecting device, and a second detecting device. The upper end of the rotating device is connected to the dynamic hole so as to be able to rotate left and right within a range of rotation angles. The driving device rotates the rotating device left and right according to a predetermined electric signal. The first detecting device detects the position of the rotating device through the Hall effect. The second detection means detects operational errors of the first detection means due to temperature changes.

Description

[0001] related application [0002] This application is based on and claims priority from Korean Application No. 2004-98104 filed on November 26, 2004, the contents of which are incorporated herein by reference. technical field [0003] The present invention generally relates to a dynamic aperture for adjusting the light quantity of a projection lens in a projection TV or a projector, and particularly relates to a dynamic aperture driving device and a control method thereof, which can utilize Hall (Hall) sensors to operate, thereby Has a simple structure and can perform precise position control regardless of changes in ambient temperature. Background technique [0004] Recently, large-screen high-definition display devices have drawn attention as one of the important aspects, represented by projection televisions (TVs) and projectors. [0005] These projection TVs and projectors operate on optical principles, figure 1 An example of the optical structure of such a projectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/74G03B21/14
CPCG02B5/005G02B7/008G03B9/04H04N5/57H04N5/74G03B21/2053H04N21/42202H04N21/4318G03B21/20
Inventor 崔东元
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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